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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91258f97e0c1ad9b941c1f4d0f909c9f31efa1d48f83f1610b7cad7ec9ad40b6' 
  AND token = 'odBlHZO7pL1nzAG5FXXEenjXTVR7uOJU8NuGLobr5AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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