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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4acd6ea526bca914da1f102c55a42e01237b5f596c6afe2a7c18c5942a75e1c' 
  AND token = 'tQQiUA+p++c0gmThBkgrjXxbTmGubLP9Qx8MUORVSZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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