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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fc7b4090a4571eb59c4eb8f737f030867f1578e0ea42b8c74a3ce3e8e0790db' 
  AND token = 'kHB8/frJvZkLAyUXHduYJvdA5E0Nj0rMdQRVPFkdbto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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