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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba8086a825f0a31d897bffbaf8b92d26d269b7914029a3df4014adae635a4164' 
  AND token = '1iFfsxE0YeG3DDpY3HA8mjObULS6VYE0VsIdjFt33do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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