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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8481c6a7fa342b1f7718e9658d886204bf66608561af20f8daca39e83ce98faf' 
  AND token = 'FWjPg4/lbiLXIvL/9cK52OT/+BFJDzt+8O54dSyY+eE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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