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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '249bc3d4c5a5850ef0e1aa74be16daac00c72afa7c7ee76c10f13814dd1cb79a' 
  AND token = 'Bntf5XGJubmob+OQBUqCOG+TqJ6ypQryPMcXGNaowNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00125

JSON explain

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