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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09c71a94f145c9bce70498ce0e2ac6903b1d580ef6fe3aecdf584c637775fe7b' 
  AND token = '2fH8frFL/whiLVCuXKTWs7Mq4fZrfB2BQapoexmjsUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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