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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72ed71a4f95829c96ae96cf021759e97178c299565ceccf123b2c9c9086a5258' 
  AND token = '3w2dkTID0RxZvwyL/Uq+J8eHnK5leC1YVlVAEkLntyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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