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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0540120ac8e0d1809ba81411c4f68f73897a8b890366913b40c5c68a47423825' 
  AND token = '2Dh2gA8Pb0KMLBsDDy6ZMRyNTbuaZaHWgf0jeEOLi5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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