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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd7c1a8d9df06c852cbbf404b4ae8bec3302becd14a7b0bfb5c1776601dd2b57' 
  AND token = 'pAkmIxz85Rk7mdokD6yux8Kko4OqKjQSCMBK0JVto7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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