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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efd789c0037a5b02d24f88430a7783a6a6b8660bd4e76c0600fff6dfb483ccf4' 
  AND token = 'VksTQmJ4HyGhzD4p0nzlJcBZiZ7sVx1pF+DO5YsH5ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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