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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e640e14e9e4c5ca74f8718da749f9db29bff2b99394e95b3fd5f5cb31012ac3' 
  AND token = 'fgmpnJfxt7T5deEu8ZH1HKVKfco1XFlTugIBStelI5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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