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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f87afbbcad7a4552d80d8a6ab7574a2dbf5326fd3a837380202e04a89219ec' 
  AND token = 'm38Vlal3li3NGIqWYG2ymXNg7V9nXjg4/2dzgGRCwx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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