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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4328f985113a009ddc84a98142992416679d55a052a596de8e397ad13f142e7' 
  AND token = '3FQCxjZy9o5Qs+RchD2Xu7KXJk+NiGkc9ExC41EtlVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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