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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fe07e13f512dcf02030036b0acb7fdfc6483d9f963de717585e5de6c0beacf8' 
  AND token = 'klRkVXo6XP7JqP1mkkbFW9TiJgv4mzsbDr71JAkzLy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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