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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8cc5ea8a7fd18a3c16a4c062a43d4edf7968eead6d55eb9d05a6ddf4b82d0f8' 
  AND token = 'hX9r7jO3572b803AZHD7Sp+AvLU4HtTRkK7VlL9aQoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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