SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd30b5549bf3032cf8570abf4131c958aef4d707ae8c2c3560ea7a24e0d8e37f2' 
  AND token = 'txZqInDYFRpgjbREbdYqDLyQqSL6VpB4vQ9uRBJJhPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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