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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9c26b552c294793ebe4335e7b0ffe3088fd16babb1906b8ecc242c1be663a63' 
  AND token = 'Szqby1qrBRfa+P03OUN5ZHOINdjGnnsBQ8xRubQwoiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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