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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7f55d30440a6313731cbe669d2e9630f8efcec111387a43ac413da4703eafc9' 
  AND token = 'P0a5yxEM0VeG5b1D5UC1n+bDRmZkZWus+WpcqF05R1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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