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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4b0c76384b7e60125362b247b7e6c554d1b13c7fd5984897fa6fa5295a9c958' 
  AND token = 'Fgad1OtCiTxsbuStmuKeiDVF3q59VgxyBn98QQo66rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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