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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebf171e63062ae6bda11d79d78c3aaa3af8eb73c9b88a9573fd27f881f24b2a0' 
  AND token = 'kz2RoqgPuISssX4jpLYmQYbQXZQ569l927i+7UNkC90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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