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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdc2adedda5d157e7bffb5a2d0fb039f3051bba49d9f53ef5a54ed8ef4024f19' 
  AND token = 'kcs3M7PA19pTksxwFTsrTshBBXbv1P99TnDiKlyTGto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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