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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd1c4412917187f007128dc83940fd190889d86de9c44afac8bedb1fd7b7bc0c' 
  AND token = '/ibrYT6Ffp3jmsMyp3Kz2xLPAnGqsmxtDH5+Xm1RH28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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