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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c74b38f9b3979837c1898027b0afad9c1dc7b5ab869430287754ecad79d39f7' 
  AND token = 'lHcbZ7vonK3L6b5wsdHSFiOUn2GSYXmNyia7aEItmXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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