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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a92ccae74d3a27256f3c69b6c2123371f03c613b2fa74666f851483c40af36d1' 
  AND token = 'YWsqgiNbi0L9JGnYYXxsqKIGe1Y1rZ8vG72Yswdyt4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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