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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a04692556fc90362d8593dc3758cd5fdf34f4d1de4dc6d2f8630a58e1540471' 
  AND token = 'juteSL0akp4l5FeWh/vAKEy2Q0BWm4fjSoQKzGmrO+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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