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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '149cad996edca61cabe9bcf738c6d382e881b6a6a59e26359d775e26048b77c7' 
  AND token = 'pAV2haX/mx3aJGw4+TTkGN3qiLSzWIxYl7dJGZNGa48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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