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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b052412dfc64c69d471dfe504944bd28c251df8fd85ab7dcde1138087d933ea8' 
  AND token = 'IMDWKO7XTREwEmKtFWWQkZ5ptI4Q+eox8PbIGg61yso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00107

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}