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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f22d2aee355e4c8ae2f7b2a3db0a7f6b2e6b6e64a8da4b3ac22075dba4733d19' 
  AND token = 'Sn7rIjs4LtFJd79ThaS2Q+VpQt5WW/V6F/CIlr7s2yY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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