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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a37e99c70065e81c94d72274de4967799166b67701e8195485668db075877b65' 
  AND token = '7PW2caiGWRlJEf6CLs4aZacBYHmis4TF6TBoOIi+B8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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