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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e97d4afa3b51437d6eebf58e421b66f02e94423556eeaa3220317cf4273a6c14' 
  AND token = 'sBzv4ZfZ4oXzS16mRRq7lPpWoYRYiutaC0e1RE2PNrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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