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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28119e36fa6dd51f69d015e38e631b5e329f4ec177e48eff3155a8ee84d36dec' 
  AND token = 'xe+JDWeSn5bJHAhtK8pofG659Ftl+XDdxp6hg2/wwwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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