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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb4fac8e70b1c54cb3822dff39cbe8d5bbeb963c71254c21a9c46b6ee805496c' 
  AND token = 'StNJpGOOqoxlZN8d2jsgay/BWY5TyD0VOBKgT4qxb3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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