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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fa613663ae61f01d88b3fc42a24acdbee2b055f78c0ca914441d186357ab044' 
  AND token = 'JIUHXK19eX0f4txajFnfP0BEH+7l0J6PyJkvOEhPYio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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