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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '277b3a406d405382fbf202d1e514709781ff9548a05470d3c5e50bb4b3302f5b' 
  AND token = 'Zi8ohd+pIETIQI0/qog9pKbTmxJi8AvLJ95vXdjR7/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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