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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85503221a749ced54b5b535a1c19cbf8dfec77fcda0626eea735e1c357156551' 
  AND token = 'Zu1IY8wISdcloRCgRxE5LF1fDYOJJLOHHTPPn+9N3UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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