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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58382677176130debd7182eaac1f89ce6e579ed0b1254982bd5eda8871c8a903' 
  AND token = 'xNyWmhj/FyHWyOGBoehZQM1o9nEPZyonWl9R+q5CSqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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