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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e73684ee97b1a9cbe036691a41572387723ac0c586e0796866c11f7658e61208' 
  AND token = 'BGZYiBJbyIX5KwDhc21o6H8F9daylLg82COAI59b92w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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