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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0934df88c70f780568c5eecf809f78f801a8b392970143b6469b90a1ede4cde3' 
  AND token = 'XUYa0/GDQlOuTu5z5eSwOGb6DfXuMDCTlR7pRsO5YbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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