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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a40d84e85eea15d3fc0c6f195200e3c25333eca9fee79729d50a06d2b6a4c36' 
  AND token = 'e8aBYaJzRT0K2F2nph0bWTiSxf0SCZztT5WnFti6I/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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