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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01c530c465c6ec797a5030894d2f6e52e4647b305d9a1bb335b64f6a415aa3ff' 
  AND token = 'eJlklxuIpJCMACX66zXBGkMr7xK66hZbl8k52qPM89w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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