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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86cc877c54fcd6762af6d111e954ba84ca6b5b2e7c9399b4d3e1285778037415' 
  AND token = 'q4EgbzU9Eac7YwDL4wleRqli6EJD91OgTOvvkBZ/tko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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