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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9add6fe3afe1fa6c352e680c3cc206bcb5eded2f2a3f00d3624b0a7d240f5d77' 
  AND token = 'I0PBU2ircfstdbKCmsCs/be9XVUDhfBCA+p7vVcjO/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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