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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ab1aaa600eae7127706cf8482738df2b9d217c99ec40df793980f72cb00bf7' 
  AND token = 'H03UU2J95FrxoFyEIozt4r2xUNFJNLm4AbHsrCrvflk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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