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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9695ee6ea945f20702625df64dcdb9f0c8a862eb58a40e1b2444c3de1a2698a0' 
  AND token = 'qgMJx3Ecc0gYETDtk3U1FSObnqvC5SR4p8ZmoRb3t5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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