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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7932477c2357deb172b6c0a1b49c1fdb33b8a4e4bb3805c84d8150e4b96d055f' 
  AND token = 'aoBHtCzaNnBx5mQpT/6+JPpITZ2kxvsoy5xxd3k+MRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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