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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c83da6d1fffb6eacd5710a76a00b10c64382d509a8b003127ce356500e7cb6' 
  AND token = '1jpa9Wdt0NnVGHWmOljj9gIPYLB8isHakL4w0cCnz+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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