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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42e5e494fe8ecd531ab54b51b8c9f46837ba75aa281d05d2b4637ad503b9044c' 
  AND token = 'xXfoI4Au2K4aCjNx/oDagKjm4wMKnEywKocbL/9iRRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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