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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fad3cf5a8a15c4588a5b8a9d9c052281c841d3352e3b94d69320e4de37fc77de' 
  AND token = 'mGCa0RgElXwzeov7jIujpZfl1fp6jGMBan9eRzu2agE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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