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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b372be15282b506ad63fc8aa2e797c401d6a2560bb3c10f256562b9daed1a6c' 
  AND token = 'f00Mk9tRglUpQv7kFKzhlUJ6aZSSF5tQTPsUtTVgnNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00110

JSON explain

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