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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd02076f1d5ad81920b546e1ebd4bfb7a400b95a4c7605d6fd736960e6852e2d7' 
  AND token = 'ChPor6fLnihZqutCCSNZXy+dSSvFKKVp6ZZkY31sVyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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