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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98ac1cbb32ec34739ad213e22ee7c333c41c4cd49d0fec5a94dda69ba48add1e' 
  AND token = 'RT7A+VVQAt5C6irf0F5KoWDgq6UXXHnVz8/GV+Z/kEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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