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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cafb317abaa8982d924bb65367ce6658deedb9ed966c89c8194e4daad66215e' 
  AND token = '5nVQOx+jaMqRfPsNIJEemWwCPnYZaXR9ZqoUWi6+0AI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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