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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09bc76d71185cb06d5bb0f60dd8b90567a39d930581129067acf7ec6b88fadc4' 
  AND token = 'dvWQ6FoN+AbghEYn8DDIv5gxDZgaxNHEXcYYVjStg3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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