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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb4a53364cd9ef15f16dd88323a74cbb4ca9f406317aee5572be3808671ade7e' 
  AND token = 'ITuAyvbl2wctQl289tJeetxJ/ffkYN+7GddZ9XUoc7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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