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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aabf716bc05984d690d7c61b2d2d1b945bfb2eec0a86c8e20abec234b35bb829' 
  AND token = 'BSaM4GoE5OXFBC9lDTp7+9OgrOEPm8oLuTw+YIlTwEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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